haulage vs tow

haulage and tow both are nouns.

Word	Noun	Adjective	Verb	Adverb
haulage	Yes	No	No	No
tow	Yes	No	Yes	No

As nouns, tow is a hyponym of haulage; that is, tow is a word with a more specific, narrower meaning than haulage:

haulage: the act of drawing or hauling something
tow: the act of hauling something (as a vehicle) by means of a hitch or rope

Other hyponyms of haulage include towage.

haulage (noun)	tow (noun)
the act of drawing or hauling something	the act of hauling something (as a vehicle) by means of a hitch or rope

haulage (verb)	tow (verb)
	drag behind