towing rope vs towline

towing rope and towline both are nouns.

Word	Noun	Adjective	Verb	Adverb
towing rope	Yes	No	No	No
towline	Yes	No	No	No

As nouns, towing rope and towline are synonyms defined as:

Other synonyms of towing rope include towing line, towrope.

towing rope (noun)	towline (noun)
(nautical) a rope used in towing	(nautical) a rope used in towing