tagger vs computer program

tagger and computer program both are nouns.

Word	Noun	Adjective	Verb	Adverb
tagger	Yes	No	No	No
computer program	Yes	No	No	No

As nouns, computer program is a hypernym of tagger; that is, computer program is a word with a broader meaning than tagger:

tagger: a computer program that attaches labels to the grammatical constituents of textual matter
computer program: (computer science) a sequence of instructions that a computer can interpret and execute

Other hypernyms of tagger include computer programme, program, programme.

tagger (noun)	computer program (noun)
a computer program that attaches labels to the grammatical constituents of textual matter	(computer science) a sequence of instructions that a computer can interpret and execute
someone who appends or joins one thing to another
someone who assigns labels to the grammatical constituents of textual matter