head word vs phrase

head word and phrase both are nouns.

Word	Noun	Adjective	Verb	Adverb
head word	Yes	No	No	No
phrase	Yes	No	Yes	No

head word (noun)	phrase (noun)
(grammar) the word in a grammatical constituent that plays the same grammatical role as the whole constituent	dance movements that are linked in a single choreographic sequence
a content word that can be qualified by a modifier	an expression consisting of one or more words forming a grammatical constituent of a sentence
	a short musical passage
	an expression whose meanings cannot be inferred from the meanings of the words that make it up

head word (verb)	phrase (verb)
	put into words or an expression
	divide, combine, or mark into phrases