WATS line vs WATS

WATS line and WATS both are nouns.

Word	Noun	Adjective	Verb	Adverb
WATS line	Yes	No	No	No
WATS	Yes	No	No	No

As nouns, WATS line and WATS are synonyms defined as:

WATS line and WATS: a telephone line; long distance service at fixed rates for fixed zones; an acronym for wide area telephone service

WATS line (noun)	WATS (noun)
a telephone line; long distance service at fixed rates for fixed zones; an acronym for wide area telephone service	a telephone line; long distance service at fixed rates for fixed zones; an acronym for wide area telephone service