lower rank vs backseat

lower rank and backseat both are nouns.

Word	Noun	Adjective	Verb	Adverb
lower rank	Yes	No	No	No
backseat	Yes	No	No	No

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

Other hyponyms of lower rank include shade, subordinateness, subsidiarity.

lower rank (noun)	backseat (noun)
the state of being inferior	a seat at the back of a vehicle (especially the seat at the back of an automobile)
	a secondary or inferior position or status