doormat vs someone

doormat and someone both are nouns.

Word	Noun	Adjective	Verb	Adverb
doormat	Yes	No	No	No
someone	Yes	No	No	No

As nouns, someone is a hypernym of doormat; that is, someone is a word with a broader meaning than doormat:

doormat: a person who is physically weak and ineffectual
someone: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of doormat include individual, mortal, person, somebody, soul.

doormat (noun)	someone (noun)
a mat placed outside an exterior door for wiping the shoes before entering	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential
a person who is physically weak and ineffectual