backseat vs dickie

backseat and dickie both are nouns.

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

As nouns, dickie is a hyponym of backseat; that is, dickie 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)
dickie: a small third seat in the back of an old-fashioned two-seater

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

backseat (noun)	dickie (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