apply vs applier

apply is not a noun while applier is a noun.

Word	Noun	Adjective	Verb	Adverb
apply	No	No	Yes	No
applier	Yes	No	No	No

apply (noun)	applier (noun)
	a device for applying a substance
	a person who requests or seeks something such as assistance or employment or admission

apply (verb)	applier (verb)
ask (for something)
refer (a word or name) to a person or thing
put into service; make work or employ for a particular purpose or for its inherent or natural purpose
coat, cover or smear a surface with
give or convey physically
avail oneself to
ensure observance of laws and rules
apply oneself to
be pertinent or relevant or applicable
be applicable to; as to an analysis