bivouac vs lager

bivouac and lager both are nouns.

Word	Noun	Adjective	Verb	Adverb
bivouac	Yes	No	Yes	No
lager	Yes	No	No	No

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

Other hyponyms of bivouac include boot camp, hutment, laager.

bivouac (noun)	lager (noun)
temporary living quarters specially built by the army for soldiers	a camp defended by a circular formation of wagons
a site where people on holiday can pitch a tent	a general term for beer made with bottom fermenting yeast (usually by decoction mashing); originally it was brewed in March or April and matured until September

bivouac (verb)	lager (verb)
live in or as if in a tent