hunker down vs stand firm

hunker down and stand firm both are verbs.

Word	Noun	Adjective	Verb	Adverb
hunker down	No	No	Yes	No
stand firm	No	No	Yes	No

As verbs, stand firm is a hypernym of hunker down; that is, stand firm is a word with a broader meaning than hunker down:

Other hypernyms of hunker down include hold firm, stand fast, stand pat.

hunker down (verb)	stand firm (verb)
hold stubbornly to a position	refuse to abandon one's opinion or belief
sit on one's heels	stand up or offer resistance to somebody or something
take shelter