dickie-seat vs dicky

dickie-seat and dicky both are nouns.

Word	Noun	Adjective	Verb	Adverb
dickie-seat	Yes	No	No	No
dicky	Yes	Yes	No	No

As nouns, dickie-seat and dicky are synonyms defined as:

dickie-seat and dicky: a small third seat in the back of an old-fashioned two-seater

Other synonyms of dickie-seat include dickey-seat, dickey, dickie, dicky-seat.

dickie-seat (noun)	dicky (noun)
a small third seat in the back of an old-fashioned two-seater	a man's detachable insert (usually starched) to simulate the front of a shirt
	a small third seat in the back of an old-fashioned two-seater

dickie-seat (adjective)	dicky (adjective)
	(British informal) faulty