airman vs. flier

airwoman vs. aviatrix

aviatress vs. aviatrix

ambassador vs. embassador

apiarist vs. beekeeper

apiculturist vs. beekeeper

applauder vs. clapper

aggregator vs. collector

arguer vs. debater

amir vs. emir

ameer vs. emir

aesthete vs. esthete

aesthetician vs. esthetician

aetiologist vs. etiologist

arboriculturist vs. forester

adulator vs. flatterer

author vs. generator

author vs. writer

androgyne vs. epicene

asker vs. inquirer

attorney vs. lawyer

assimilator vs. learner

amah vs. maid

amah vs. wetnurse

automobilist vs. motorist

accoucheuse vs. midwife

accommodator vs. obliger

accoucheur vs. obstetrician

apothecary vs. chemist

altruist vs. philanthropist

allayer vs. comforter

anchorite vs. hermit

answerer vs. respondent

ambler vs. stroller

addlehead vs. loon

actuary vs. statistician

amanuensis vs. stenographer

annoyer vs. tease

attempter vs. trier

arriviste vs. upstart

arouser vs. waker

autocrat vs. tyrant

attestor vs. witness

attestator vs. witness

aberration vs. distortion

aberration vs. deviance

abiogenesis vs. autogenesis

abiogenesis vs. autogeny

allotropism vs. allotropy

airstream vs. wash

alluviation vs. deposit

abrasion vs. scratch

aurora vs. morning

arc vs. discharge

arc vs. bow

arc vs. curve

ament vs. catkin

archespore vs. archesporium

aquilegia vs. columbine

aquilege vs. columbine

algarroba vs. algarrobilla

algarobilla vs. algarroba

algarroba vs. carob

albizia vs. albizzia

anthurium vs. tailflower

arugula vs. rocket

ageratum vs. mistflower

agueweed vs. boneset

alecost vs. costmary

althea vs. hollyhock

althaea vs. hollyhock

arere vs. samba

achira vs. arrowroot

andelmin vs. angelim

anil vs. indigo

amboyna vs. padouk

agrimonia vs. agrimony

arishth vs. neem

alfilaria vs. filaria

alfileria vs. filaria

alumbloom vs. alumroot

alkanet vs. bugloss

astrantia vs. masterwort

archil vs. orchil

archil vs. cudbear

annulus vs. skirt

annulus vs. ring

antherozoid vs. spermatozoid

autophyte vs. autotroph

acres vs. land

apanage vs. appanage

alimony vs. maintenance

amercement vs. fine

annuity vs. rente

agio vs. premium

agiotage vs. premium

amenities vs. comforts

Americanisation vs. Americanization

androgenesis vs. androgeny

Anglicisation vs. Anglicization

anthropogenesis vs. anthropogeny

antisepsis vs. asepsis

antisepsis vs. sterility

antisepsis vs. sterileness

acclimatisation vs. acclimatization

acclimation vs. acclimatization

anthesis vs. flowering

agenesia vs. agenesis

accouchement vs. childbearing

ar vs. are

arcdegree vs. degree

arcsecond vs. second

arcminute vs. minute

abamp vs. abampere

aught vs. nothing

applicability vs. pertinence

applicability vs. pertinency

agnation vs. patrilineage

arcsin vs. arcsine

asynchronism vs. asynchrony

asynchronism vs. desynchronization

asynchronism vs. desynchronisation

asynchronism vs. desynchronizing

affaire vs. involvement

amour vs. involvement

astigmatism vs. astigmia

acantha vs. spine

anarchy vs. lawlessness

acephalia vs. acephaly

acephalia vs. acephalism

alkalinuria vs. alkaluria

acromicria vs. acromikria

agalactia vs. agalactosis

anchylosis vs. ankylosis

anorchidism vs. anorchism

anorchia vs. anorchism

anhidrosis vs. anhydrosis

arteriectasia vs. arteriectasis

asynergia vs. asynergy

anestrum vs. anestrus

anestrus vs. anoestrus

anestrus vs. anoestrum

abeyance vs. suspension

aboulia vs. abulia

acapnia vs. hypocapnia

asthenopia vs. eyestrain

autonomy vs. liberty

acroanaesthesia vs. acroanesthesia

apoplexy vs. stroke

agranulocytosis vs. agranulosis

agranulocytosis vs. granulocytopenia

asynclitism vs. obliquity

alcaptonuria vs. alkaptonuria

akinesia vs. akinesis

acholia vs. cholestasis

anuresis vs. anuria

ailment vs. complaint

angioedema vs. atrophedema

atopognosia vs. atopognosis

amyotrophia vs. amyotrophy

agraphia vs. anorthography

agraphia vs. logagraphia

aneurism vs. aneurysm

aldosteronism vs. hyperaldosteronism

ataxia vs. ataxy

ataxia vs. dyssynergia

achondroplasia vs. achondroplasty

achondroplasia vs. chondrodystrophy

anencephalia vs. anencephaly

adactylia vs. adactyly

adactylia vs. adactylism

acrocephaly vs. oxycephaly

amebiasis vs. amoebiasis

amebiasis vs. amebiosis

amebiasis vs. amoebiosis

adenomyosis vs. endometriosis

avitaminosis vs. hypovitaminosis

azotemia vs. uremia

azotaemia vs. uremia

adenomyosarcoma vs. nephroblastoma

acetonuria vs. ketonuria

amenorrhea vs. amenorrhoea

amenia vs. amenorrhea

acetonemia vs. ketonemia

ache vs. yen

ache vs. hurt

ache vs. smart

acromegalia vs. acromegaly

acousticophobia vs. phonophobia

Alzheimer's vs. Alzheimers

aphonia vs. voicelessness

acariasis vs. acariosis

acariasis vs. acaridiasis

anonymity vs. namelessness

abjection vs. degradation

ascendance vs. control

ascendence vs. control

ascendancy vs. control

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