part vs world

part and world both are nouns.

Word	Noun	Adjective	Verb	Adverb
part	Yes	No	Yes	Yes
world	Yes	Yes	No	No

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

Other hyponyms of part include body part, corpus, acicula, base, corner, craton, cutting, fragment, hunk, lump, nub, stub, segment, slice, strip.

part (noun)	world (noun)
the actions and activities assigned to or required or expected of a person or group	all of the living human inhabitants of the earth
the effort contributed by a person in bringing about a result	all of your experiences that determine how things appear to you
something less than the whole of a human artifact	the concerns of this life as distinguished from heaven and the afterlife
an item that is an instance of some type	people in general; especially a distinctive group of people with some shared interest
a line of scalp that can be seen when sections of hair are combed in opposite directions	people in general considered as a whole
one of the portions into which something is regarded as divided and which together constitute a whole	the 3rd planet from the sun; the planet we live on
an actor's portrayal of someone in a play	everything that exists anywhere
that which concerns a person with regard to a particular role or situation	a part of the earth that can be considered separately
the melody carried by a particular voice or instrument in polyphonic music
the extended spatial location of something
a portion of a natural object
assets belonging to or due to or contributed by an individual person or group
something determined in relation to something that includes it

part (adjective)	world (adjective)
	involving the entire earth; not limited or provincial in scope

part (verb)	world (verb)
move or break apart
force, take, or pull apart
depart for someplace
go one's own way; move apart
discontinue an association or relation; go different ways

part (adverb)	world (adverb)
to some extent; in some degree; not wholly