send vs send on

send and send on both are verbs.

Word	Noun	Adjective	Verb	Adverb
send	No	No	Yes	No
send on	No	No	Yes	No

As verbs, send on is a hyponym of send; that is, send on is a word with a more specific, narrower meaning than send:

send: transport commercially
send on: send or ship onward from an intermediate post or station in transit

Other hyponyms of send include barge, railroad, despatch, dispatch, send off, forward.

send (verb)	send on (verb)
cause to be directed or transmitted to another place	send or ship onward from an intermediate post or station in transit
transfer
broadcast over the airwaves, as in radio or television
assign to a station
to cause or order to be taken, directed, or transmitted to another place
transport commercially
cause to go somewhere
cause to be admitted; of persons to an institution