unsalable vs. unsaleable

unmarketable vs. unmerchantable

unmarketable vs. unvendible

urbanised vs. urbanized

undercoated vs. undersealed

unsterilised vs. unsterilized

unguaranteed vs. unsecured

unbarred vs. unsecured

unbolted vs. unsecured

unlatched vs. unsecured

unlocked vs. unsecured

unserviceable vs. unusable

unserviceable vs. unuseable

unshaped vs. unshapen

unshaved vs. unshaven

unanalyzable vs. undecomposable

unshod vs. unshoed

umpteenth vs. umteenth

umpteenth vs. umptieth

unnotched vs. untoothed

ungreased vs. unlubricated

unspecialised vs. unspecialized

uncurved vs. uncurving

unsympathising vs. unsympathizing

unfounded vs. wild

uncorroborated vs. unsubstantiated

unpersuadable vs. unsuasible

uncluttered vs. unlittered

unflavored vs. unflavoured

untamed vs. wild

unrefreshed vs. unrested

untired vs. unwearied

untired vs. unweary

untrusting vs. wary

untrustworthy vs. untrusty

untraveled vs. untravelled

untraveled vs. untraversed

Utopian vs. utopian

unification vs. union

ungulate vs. ungulated

unguiculate vs. unguiculated

unaerated vs. unoxygenated

undesired vs. unsought

unwelcome vs. unwelcome

unwelcome vs. unwished

UV vs. ultraviolet

unbaptised vs. unbaptized

uniovular vs. uniovulate

uveal vs. uveous

universalist vs. universalistic

undulant vs. undulatory

uncollected vs. ungathered

unit vs. whole

undoing vs. untying

unfastening vs. untying

usage vs. use

use vs. utilization

use vs. utilisation

use vs. utilise

use vs. utilize

unionisation vs. unionization

undercut vs. undersell

unification vs. uniting

usage vs. usance

upheaval vs. uplift

upheaval vs. upthrow

upheaval vs. upthrust

usefulness vs. utility

uranalysis vs. urinalysis

unitisation vs. unitization

unction vs. unctuousness

usury vs. vigorish

usury vs. vig

urgency vs. urging

unsnarling vs. untangling

urochord vs. urochordate

undercoat vs. underfur

undercoat vs. underseal

uke vs. ukulele

underclothes vs. underwear

underclothing vs. underwear

unease vs. uneasiness

uncomfortableness vs. uneasiness

untrustiness vs. untrustworthiness

undependability vs. undependableness

undependability vs. unreliability

undependability vs. unreliableness

unsociability vs. unsociableness

ugliness vs. wickedness

unsuitability vs. unsuitableness

unity vs. wholeness

unevenness vs. variability

unseasonableness vs. untimeliness

uniformity vs. uniformness

unpredictability vs. volatility

unchangeability vs. unchangingness

unchangeableness vs. unchangingness

uncertainness vs. uncertainty

unpalatability vs. unpalatableness

unlikelihood vs. unlikeliness

unambiguity vs. unequivocalness

unacceptability vs. unacceptableness

uprightness vs. verticality

uprightness vs. verticalness

uppishness vs. uppityness

unconstraint vs. wantonness

unruliness vs. wilfulness

undercurrent vs. undertone

unappetisingness vs. unappetizingness

underbelly vs. underbody

unfavorableness vs. unfavourableness

unprofitability vs. unprofitableness

utricle vs. utriculus

uterus vs. womb

unawareness vs. unknowingness

urticaria vs. urtication

underestimate vs. underestimation

underestimate vs. underrating

underestimate vs. underreckoning

underestimate vs. underrate

underestimate vs. undervalue

undercurrent vs. undertide

underline vs. underscore

undulation vs. wave

underachiever vs. underperformer

ulama vs. ulema

underbrush vs. undergrowth

underbrush vs. underwood

ump vs. umpire

utiliser vs. utilizer

undergrad vs. undergraduate

ulcer vs. ulceration

urbanisation vs. urbanization

urochesia vs. urochezia

ubiquitousness vs. ubiquity

ultimacy vs. ultimateness

uraemia vs. uremia

urine vs. water

unroll vs. unwind

uncloak vs. unmask

unbrace vs. untie

unbrace vs. unlace

unify vs. unite

unravel vs. unscramble

unpick vs. unravel

unknot vs. unravel

unravel vs. untangle

unfurl vs. unroll

uniformize vs. work

uniformise vs. work

undo vs. unwrap

ululate vs. yawl

underact vs. underplay

undo vs. unmake

unloose vs. unloosen

unlade vs. unload

underachieve vs. underperform

valiantly vs. valorously

vigilantly vs. watchfully

verbosely vs. windily

verbosely vs. wordily

voluminous vs. winding

viable vs. workable

voiceless vs. voteless

vehement vs. violent

violent vs. wild

valiant vs. valorous

vinaceous vs. vinous

vibrant vs. vivacious

verticillate vs. whorled

vernacular vs. vulgar

variable vs. varying

vacuum vs. void

vacancy vs. void

vinegarish vs. vinegary

valediction vs. valedictory

ventricose vs. ventricous

various vs. versatile

vacillant vs. vacillating

vacillant vs. wavering

variant vs. variation

variant vs. variate

variance vs. variant

verrucose vs. warty

verrucose vs. wartlike

visionary vs. windy

voluntary vs. volunteer

vacuolate vs. vacuolated

variolar vs. variolic

variolar vs. variolous

vulval vs. vulvar

volumetric vs. volumetrical

viricidal vs. virucidal

veterinarian vs. veterinary

voyeuristic vs. voyeuristical

viatication vs. viaticus

vomit vs. vomiting

vomit vs. vomitive