stigma vs spiracle

stigma and spiracle both are nouns.

Word	Noun	Adjective	Verb	Adverb
stigma	Yes	No	No	No
spiracle	Yes	No	No	No

As nouns, spiracle is a hypernym of stigma; that is, spiracle is a word with a broader meaning than stigma:

stigma (noun)	spiracle (noun)
a skin lesion that is a diagnostic sign of some disease	a breathing orifice
an external tracheal aperture in a terrestrial arthropod
a symbol of disgrace or infamy
the apical end of the style where deposited pollen enters the pistil