end vs terminus

end and terminus both are nouns.

Word	Noun	Adjective	Verb	Adverb
end	Yes	No	Yes	No
terminus	Yes	No	No	No

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

end: the state of affairs that a plan is intended to achieve and that (when achieved) terminates behavior intended to achieve it
terminus: the ultimate goal for which something is done

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

end (noun)	terminus (noun)
the part you are expected to play	either end of a railroad or bus route
(American football) a position on the line of scrimmage, designating players at each end of the defensive line	station where transport vehicles load or unload passengers or goods
a piece of cloth that is left over after the rest has been used or sold	(architecture) a statue or a human bust or an animal carved out of the top of a square pillar; originally used as a boundary marker in ancient Rome
a final part or section	the ultimate goal for which something is done
the state of affairs that a plan is intended to achieve and that (when achieved) terminates behavior intended to achieve it	a place where something ends or is complete
the last section of a communication
the final stage or concluding parts of an event or occurrence
either extremity of something that has length
a boundary marking the extremities of something
the surface at either extremity of a three-dimensional object
one of two places from which people are communicating to each other
(football) the person who plays at one end of the line of scrimmage
a final state
the point in time at which something ends

end (verb)	terminus (verb)
bring to an end or halt
put an end to
have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical
be the end of; be the last or concluding part of