syntagma vs linguistic string

syntagma and linguistic string both are nouns.

Word	Noun	Adjective	Verb	Adverb
syntagma	Yes	No	No	No
linguistic string	Yes	No	No	No

As nouns, linguistic string is a hypernym of syntagma; that is, linguistic string is a word with a broader meaning than syntagma:

syntagma: a syntactic string of words that forms a part of some larger syntactic unit
linguistic string: a linear sequence of words as spoken or written

Other hypernyms of syntagma include string of words, word string.

syntagma (noun)	linguistic string (noun)
a syntactic string of words that forms a part of some larger syntactic unit	a linear sequence of words as spoken or written