haul vs tow

haul and tow both are nouns.

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

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

haul: 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 haul include towage.

haul (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
the quantity that was caught

haul (verb)	tow (verb)
transport in a vehicle	drag behind
draw slowly or heavily