backseat vs dickey

backseat and dickey both are nouns.

Word	Noun	Adjective	Verb	Adverb
backseat	Yes	No	No	No
dickey	Yes	Yes	No	No

As nouns, dickey is a hyponym of backseat; that is, dickey is a word with a more specific, narrower meaning than backseat:

backseat: a seat at the back of a vehicle (especially the seat at the back of an automobile)
dickey: a small third seat in the back of an old-fashioned two-seater

Other hyponyms of backseat include dickey-seat, dickie-seat, dickie, dicky-seat, dicky.

backseat (noun)	dickey (noun)
a seat at the back of a vehicle (especially the seat at the back of an automobile)	a man's detachable insert (usually starched) to simulate the front of a shirt
a secondary or inferior position or status	a small third seat in the back of an old-fashioned two-seater

backseat (adjective)	dickey (adjective)
	(British informal) faulty