authorization vs. potency

authorization vs. mandate

acculturation vs. socialization

acculturation vs. assimilation

acculturation vs. culture

amortisation vs. amortization

appeasement vs. calming

allowance vs. tolerance

ageism vs. agism

armament vs. arming

arming vs. equipping

affray vs. disturbance

affray vs. altercation

affray vs. fracas

appeal vs. charm

appeal vs. appealingness

appeal vs. solicitation

appeal vs. prayer

appeal vs. invoke

appeal vs. attract

affirmation vs. avowal

affirmation vs. avouchment

affirmation vs. statement

affirmation vs. assertion

auspices vs. protection

aegis vs. protection

aegis vs. breastplate

aegis vs. egis

approval vs. blessing

approval vs. commendation

admiration vs. esteem

admiration vs. wonder

admiration vs. wonderment

arbitrament vs. arbitration

arbitration vs. arbitrement

allegiance vs. commitment

allegiance vs. fealty

adherence vs. adhesion

adherence vs. bond

adherence vs. adhesiveness

advocacy vs. protagonism

amnesty vs. pardon

affront vs. insult

attendance vs. attending

answer vs. resolution

answer vs. response

answer vs. serve

ambuscade vs. ambush

ambush vs. trap

ambush vs. scupper

ambush vs. bushwhack

ambush vs. waylay

ambush vs. lurk

admission vs. admittance

admission vs. entree

admittance vs. entree

assemblage vs. hookup

assemblage vs. gathering

accenting vs. emphasizing

accentuation vs. emphasizing

awakening vs. wakening

animalcule vs. animalculum

arborvirus vs. arbovirus

archaebacteria vs. archaebacterium

archaebacteria vs. archaeobacteria

archaebacteria vs. archeobacteria

acidophil vs. acidophile

alga vs. algae

amphioxus vs. lancelet

amnion vs. amnios

angelfish vs. spadefish

archaeopteryx vs. archeopteryx

amadavat vs. avadavat

alligator vs. gator

ankylosaur vs. ankylosaurus

allosaur vs. allosaurus

apatosaur vs. apatosaurus

apatosaur vs. brontosaur

apatosaur vs. brontosaurus

anteater vs. echidna

anteater vs. numbat

aardvark vs. anteater

anteater vs. pangolin

alula vs. calypter

actinozoan vs. anthozoan

anemone vs. windflower

actinia vs. actinian

actinia vs. actiniarian

arrowworm vs. chaetognath

angleworm vs. earthworm

aplacophoran vs. solenogaster

adjutant vs. aide

albatross vs. mollymawk

albatross vs. millstone

anhinga vs. darter

andrena vs. andrenid

ant vs. emmet

ant vs. pismire

aurochs vs. urus

aurochs vs. wisent

argal vs. argali

aoudad vs. audad

ape vs. copycat

ape vs. imitator

ape vs. emulator

ape vs. aper

ape vs. caricature

angwantibo vs. potto

angler vs. monkfish

anglerfish vs. monkfish

allmouth vs. monkfish

antenna vs. feeler

amberfish vs. amberjack

acetanilid vs. acetanilide

acetanilide vs. phenylacetamide

acetanilide vs. acetophenetidin

acetanilide vs. acetphenetidin

acetanilide vs. phenacetin

abatis vs. abattis

abattoir vs. butchery

acetate vs. ethanoate

abradant vs. abrader

abstractionism vs. unrealism

accelerator vs. throttle

accelerator vs. gun

accelerator vs. catalyst

appurtenance vs. paraphernalia

appurtenance vs. gear

accumulator vs. collector

accumulator vs. gatherer

amulet vs. talisman

airline vs. airway

adumbration vs. foreshadowing

anachronism vs. mistiming

anachronism vs. misdating

adz vs. adze

airway vs. skyway

altarpiece vs. reredos

airplane vs. plane

aeroplane vs. plane

alum vs. alumnus

airdrome vs. airport

aerodrome vs. airport

airport vs. drome

afterthought vs. reconsideration

afterthought vs. rethink

aglet vs. aiglet

aglet vs. aiguilette

airship vs. dirigible

airstrip vs. strip

agonist vs. protagonist

amidopyrine vs. aminopyrine

aigret vs. aigrette

aisle vs. gangway

alarm vs. dismay

alarm vs. consternation

alarm vs. appall

alarm vs. horrify

acrylic vs. nylon

ammo vs. ammunition

Adam vs. go

alcove vs. bay

airdock vs. hangar

amphetamine vs. speed

airfield vs. field

alidad vs. alidade

adapter vs. adaptor

adapter vs. arranger

adapter vs. transcriber

aerofoil vs. airfoil

airfoil vs. surface

amphitheater vs. amphitheatre

amphitheater vs. coliseum

alley vs. alleyway

antagonist vs. opponent

area vs. expanse

area vs. region

area vs. country

area vs. field

antechamber vs. anteroom

anteroom vs. hall

anteroom vs. foyer

anteroom vs. lobby

anteroom vs. vestibule

anvil vs. incus

arena vs. bowl

arena vs. field

apartment vs. flat

argyle vs. argyll

analyser vs. analyzer

anamorphism vs. anamorphosis

apparatus vs. setup

arm vs. branch

arm vs. limb

arm vs. sleeve

arm vs. weapon

arm vs. leg

arm vs. subdivision

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