instillment vs instilment

instillment and instilment both are nouns.

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

As nouns, instillment and instilment are synonyms defined as:

instillment and instilment: the introduction of a liquid (by pouring or injection) drop by drop

Other synonyms of instillment include instillation.

instillment (noun)	instilment (noun)
the introduction of a liquid (by pouring or injection) drop by drop	the introduction of a liquid (by pouring or injection) drop by drop