machine-accessible vs on-line

machine-accessible and on-line both are adjectives.

Word	Noun	Adjective	Verb	Adverb
machine-accessible	No	Yes	No	No
on-line	No	Yes	No	No

machine-accessible (adjective)	on-line (adjective)
stored in, controlled by, or in direct communication with a central computer	connected to a computer network or accessible by computer
	on a regular route of a railroad or bus or airline system
	being in progress now