instilment vs intromission

instilment and intromission both are nouns.

Word	Noun	Adjective	Verb	Adverb
instilment	Yes	No	No	No
intromission	Yes	No	No	No

As nouns, intromission is a hypernym of instilment; that is, intromission is a word with a broader meaning than instilment:

instilment: the introduction of a liquid (by pouring or injection) drop by drop
intromission: the act of putting one thing into another

Other hypernyms of instilment include insertion, introduction.

instilment (noun)	intromission (noun)
the introduction of a liquid (by pouring or injection) drop by drop	the act of putting one thing into another