rear vs rearward

rear and rearward both are nouns.

Word	Noun	Adjective	Verb	Adverb
rear	Yes	Yes	Yes	No
rearward	Yes	Yes	No	Yes

As adjectives, rear and rearward are synonyms defined as:

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

Other hyponyms of rear include nape, nucha, scruff.

rear (noun)	rearward (noun)
the side that goes last or is not normally seen	direction toward the rear
the fleshy part of the human body that you sit on
the back of a military formation or procession
the side of an object that is opposite its front
the part of something that is furthest from the normal viewer

rear (adjective)	rearward (adjective)
located in or toward the back or rear	located in or toward the back or rear
	directed or moving toward the rear

rear (verb)	rearward (verb)
construct, build, or erect
stand up on the hind legs, of quadrupeds
cause to rise up
look after a child until it is an adult
rise up

rear (adverb)	rearward (adverb)
	at or to or toward the back or rear