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Appendage

An item attached to another/ added item (S:attachment, A:detached)

Arcane

a secret only a few people understand (S:mysterious, A:known)

Archetype

original design/example (S:original, A:imitation)

Ballyhoo

loud/exaggerated promotion to get people excited about something (S:hype, A:calm)

Bedlam

Extreme and total chaos (S:commotion, A:quiet)

Bellicose

being egar to start a fight (S:aggressive, A:peaceful)

Billet-doux

a love letter/ sweet romantic note (S:love letter, A:hate mail)

Bizarre

unexpected contrast, out of the ordinary (S:weird, A:ordinary)

Bombast

speech/writing with big words to sound impressive, but lack really meaning (S:rant, A:simplicity)

Bona fide

genuine or real (S:authentic, A:fake)