grammar vs morphology

grammar and morphology both are nouns.

Word	Noun	Adjective	Verb	Adverb
grammar	Yes	No	No	No
morphology	Yes	No	No	No

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

grammar: the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)
morphology: studies of the rules for forming admissible words

Other hyponyms of grammar include descriptive grammar, prescriptive grammar, syntax.

grammar (noun)	morphology (noun)
the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)	the branch of biology that deals with the structure of animals and plants
	studies of the rules for forming admissible words
	the admissible arrangement of sounds in words
	the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms