emulation vs aspiration

emulation and aspiration both are nouns.

Word	Noun	Adjective	Verb	Adverb
emulation	Yes	No	No	No
aspiration	Yes	No	No	No

As nouns, aspiration is a hypernym of emulation; that is, aspiration is a word with a broader meaning than emulation:

Other hypernyms of emulation include ambition, dream.

emulation (noun)	aspiration (noun)
effort to equal or surpass another	the act of inhaling; the drawing in of air (or other gases) as in breathing
(computer science) technique of one machine obtaining the same results as another	a will to succeed
ambition to equal or excel	a manner of articulation involving an audible release of breath
	a cherished desire