towing line vs towrope

towing line and towrope both are nouns.

Word	Noun	Adjective	Verb	Adverb
towing line	Yes	No	No	No
towrope	Yes	No	No	No

As nouns, towing line and towrope are synonyms defined as:

Other synonyms of towing line include towing rope, towline.

towing line (noun)	towrope (noun)
(nautical) a rope used in towing	(nautical) a rope used in towing