main entry word vs word form

main entry word and word form both are nouns.

Word	Noun	Adjective	Verb	Adverb
main entry word	Yes	No	No	No
word form	Yes	No	No	No

As nouns, word form is a hypernym of main entry word; that is, word form is a word with a broader meaning than main entry word:

main entry word: the form of a word that heads a lexical entry and is alphabetized in a dictionary
word form: the phonological or orthographic sound or appearance of a word that can be used to describe or identify something

Other hypernyms of main entry word include descriptor, form, signifier.

main entry word (noun)	word form (noun)
the form of a word that heads a lexical entry and is alphabetized in a dictionary	the phonological or orthographic sound or appearance of a word that can be used to describe or identify something