lighterage vs conveyance

lighterage and conveyance both are nouns.

Word	Noun	Adjective	Verb	Adverb
lighterage	Yes	No	No	No
conveyance	Yes	No	No	No

As nouns, conveyance is a hypernym of lighterage; that is, conveyance is a word with a broader meaning than lighterage:

Other hypernyms of lighterage include transfer, transferral, transport, transportation.

lighterage (noun)	conveyance (noun)
the transportation of goods on a lighter	act of transferring property title from one person to another
the fee charged for carrying goods in lighters	the act of moving something from one location to another
	something that serves as a means of transportation
	the transmission of information
	document effecting a property transfer