If the word "autotonsorialist" actually exists, it is a noun designating a person who cuts his or her own hair.
Someone who cuts his/her own hair or looks like they cut his/her own hair.The word 'autotonsorialist' is a noun, a singular, common, concrete noun; a word for someone who cut's their own hair; a word for a person.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.