sigh vs suspire

sigh is a noun but suspire is not a noun.

Word	Noun	Adjective	Verb	Adverb
sigh	Yes	No	Yes	No
suspire	No	No	Yes	No

As verbs, sigh and suspire are synonyms defined as:

As verbs, suspire is a hypernym of sigh; that is, suspire is a word with a broader meaning than sigh:

Other hypernyms of sigh include breathe, respire, take a breath.

sigh (noun)	suspire (noun)
an utterance made by exhaling audibly
a sound like a person sighing

sigh (verb)	suspire (verb)
heave or utter a sigh; breathe deeply and heavily	draw air into, and expel out of, the lungs
utter with a sigh	heave or utter a sigh; breathe deeply and heavily