broadcast vs instalment

broadcast and instalment both are nouns.

Word	Noun	Adjective	Verb	Adverb
broadcast	Yes	No	Yes	No
instalment	Yes	No	No	No

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

broadcast (noun)	instalment (noun)
message that is transmitted by radio or television	the act of installing something (as equipment)
a radio or television show	a part of a broadcast serial
	a part of a published serial

broadcast (verb)	instalment (verb)
cause to become widely known
broadcast over the airwaves, as in radio or television
sow over a wide area, especially by hand