defy vs stand firm

defy and stand firm both are verbs.

Word	Noun	Adjective	Verb	Adverb
defy	No	No	Yes	No
stand firm	No	No	Yes	No

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

Other hypernyms of defy include hold out, resist, withstand.

defy (verb)	stand firm (verb)
challenge	refuse to abandon one's opinion or belief
resist or confront with resistance	stand up or offer resistance to somebody or something
elude, especially in a baffling way