steal vs plagiarise

steal is a noun but plagiarise is not a noun.

Word	Noun	Adjective	Verb	Adverb
steal	Yes	No	Yes	No
plagiarise	No	No	Yes	No

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

steal: take without the owner's consent
plagiarise: take without referencing from someone else's writing or speech; of intellectual property

steal (noun)	plagiarise (noun)
a stolen base; an instance in which a base runner advances safely during the delivery of a pitch (without the help of a hit or walk or passed ball or wild pitch)
an advantageous purchase

steal (verb)	plagiarise (verb)
steal a base	take without referencing from someone else's writing or speech; of intellectual property
move stealthily
take without the owner's consent