main entry word vs citation form

main entry word and citation form both are nouns.

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

As nouns, main entry word and citation form are synonyms defined as:

main entry word and citation form: the form of a word that heads a lexical entry and is alphabetized in a dictionary

Other synonyms of main entry word include entry word.

main entry word (noun)	citation form (noun)
the form of a word that heads a lexical entry and is alphabetized in a dictionary	the form of a word that heads a lexical entry and is alphabetized in a dictionary