tufa vs. tuff

tryptophan vs. tryptophane

thyrotrophin vs. thyrotropin

tombac vs. tombak

tambac vs. tombac

tenderiser vs. tenderizer

thrombokinase vs. thromboplastin

twelvemonth vs. year

trice vs. wink

twinkling vs. wink

transpirate vs. transpire

transform vs. transmute

transform vs. transubstantiate

transform vs. translate

transcribe vs. transliterate

trounce vs. whip

tsk vs. tut

terrify vs. terrorise

terrify vs. terrorize

unkindly vs. unsympathetic

unimpeachably vs. unquestionably

unfortunately vs. unluckily

upwind vs. weather

up vs. upward

up vs. upwards

upward vs. upwards

upwardly vs. upwards

upriver vs. upstream

upstair vs. upstairs

unauthorized vs. unofficially

unauthorised vs. unofficially

unofficially vs. wildcat

unambiguously vs. uniquely

unambiguously vs. unequivocally

uncertainly vs. unsteadily

unproductively vs. unprofitably

unintelligibly vs. ununderstandably

undependably vs. unfaithfully

unfaithfully vs. unreliably

uncaring vs. unthinking

unreflective vs. unthinking

unthinking vs. unthoughtful

unknowingly vs. unwittingly

unfavorably vs. unfavourably

unappreciatively vs. ungratefully

unequally vs. unevenly

uninformatively vs. uninstructively

unmanfully vs. unmanly

unmanful vs. unmanly

unmanlike vs. unmanly

unrecognisable vs. unrecognizably

unrecognisable vs. unrecognizable

untimely vs. wrong

undesirably vs. unwantedly

underarm vs. underhand

underarm vs. underhanded

underhand vs. underhandedly

unimaginably vs. unthinkably

upmost vs. uppermost

unalterably vs. unchangeably

unalterably vs. unassailably

unarguably vs. undisputedly

unachievably vs. unattainably

unbeknown vs. unbeknownst

unreasoningly vs. viscerally

uncut vs. uncut

uncut vs. unmown

uncut vs. untrimmed

unaccommodating vs. unobliging

unexceptionable vs. unimpeachable

unacceptable vs. unaccepted

unacceptable vs. unashamed

unacceptable vs. unsufferable

unapproachable vs. unreachable

unapproachable vs. unreached

unrecognised vs. unrecognized

unappreciated vs. unsung

unappreciated vs. unvalued

unappreciated vs. ungratifying

unknown vs. unsung

unadorned vs. undecorated

unaffected vs. untouched

unaffected vs. unmoved

uninfluenced vs. unswayed

uninfluenced vs. untouched

untasted vs. untouched

unmannered vs. unmannerly

unalert vs. unwatchful

unalert vs. unvigilant

unblinking vs. unflinching

unblinking vs. unintimidated

unblinking vs. unshrinking

uncertain vs. unsure

uncertain vs. unsealed

uncertain vs. unstable

uncertain vs. unsettled

unambiguous vs. unequivocal

unambiguous vs. univocal

unexpressed vs. unspoken

unsaid vs. unspoken

unspoken vs. unstated

unspoken vs. unuttered

unspoken vs. unverbalized

unspoken vs. unverbalised

unspoken vs. unvoiced

unarmored vs. unarmoured

undue vs. unreasonable

undue vs. unwarranted

undue vs. unjustified

unappealing vs. unsympathetic

unappealing vs. unlikable

unappealing vs. unlikeable

unattached vs. uncommitted

unengaged vs. unpledged

unengaged vs. unpromised

unascribable vs. unattributable

undone vs. unstuck

unabashed vs. unembarrassed

unattractive vs. untempting

unprepossessing vs. unpresentable

unassailable vs. untouchable

unauthorised vs. unauthorized

unaccredited vs. unlicensed

unaccredited vs. unlicenced

unfathomed vs. unsounded

unplumbed vs. unsounded

unsuspecting vs. unsuspicious

unknowledgeable vs. unwitting

unknowing vs. unwitting

unintentional vs. unwitting

unplanned vs. unwitting

ugly vs. wretched

ugly vs. unworthy

ugly vs. worthless

unbarreled vs. unbarrelled

unreassuring vs. worrisome

unexceeded vs. unexcelled

unexcelled vs. unsurpassed

unlovely vs. unpicturesque

unblemished vs. unmarred

unblemished vs. unmutilated

unsoiled vs. unstained

unspotted vs. unstained

unstained vs. unvarnished

undaunted vs. undismayed

undaunted vs. unshaken

unchained vs. unfettered

unchained vs. unshackled

unchained vs. untied

unlaced vs. untied

unfastened vs. untied

unbuttoned vs. unlaced

unbuttoned vs. unfastened

unlighted vs. unlit

unilluminated vs. unlighted

uncrystallised vs. uncrystallized

unbroken vs. unplowed

unbroken vs. unploughed

unflurried vs. unruffled

unflustered vs. unruffled

unperturbed vs. unruffled

unadapted vs. unadjusted

unsound vs. unstable

unaltered vs. unchanged

unionised vs. unionized

uncivilized vs. wild

uncivilised vs. wild

uncategorised vs. uncategorized

uncategorized vs. unsorted

uncolored vs. uncoloured

unbleached vs. uncolored

uncolored vs. undyed

unchristianly vs. unchristlike

unclear vs. undecipherable

unclear vs. unreadable

unsparing vs. unstinted

unsparing vs. unstinting

unwashed vs. vulgar

utmost vs. uttermost

unappareled vs. unattired

unappareled vs. unclad

unappareled vs. undressed

unappareled vs. ungarbed

unappareled vs. ungarmented

uneasy vs. unquiet

uncommercialised vs. uncommercialized

unequaled vs. unique

unequalled vs. unique

unique vs. unparalleled

unpronounceable vs. unutterable

unspeakable vs. unutterable

untellable vs. unutterable

unnameable vs. unutterable

unentitled vs. unqualified

unfirm vs. unsteady

umbellar vs. umbellate

unfocused vs. unfocussed

unconfined vs. unimprisoned

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