bench vs window seat

bench and window seat both are nouns.

Word	Noun	Adjective	Verb	Adverb
bench	Yes	No	Yes	No
window seat	Yes	No	No	No

As nouns, window seat is a hyponym of bench; that is, window seat is a word with a more specific, narrower meaning than bench:

Other hyponyms of bench include banquette, flat bench, park bench, penalty box, church bench, pew, prie-dieu, settee, settle.

bench (noun)	window seat (noun)
a long seat for more than one person	a bench or similar seat built into a window recess
a strong worktable for a carpenter or mechanic
(law) the seat for judges in a courtroom
persons who administer justice
the reserve players on a team
a level shelf of land interrupting a declivity (with steep slopes above and below)

bench (verb)	window seat (verb)
To lift a weight using a bench press
To exercise using a bench press
exhibit on a bench
take out of a game; of players