office boy vs employee

office boy and employee both are nouns.

Word	Noun	Adjective	Verb	Adverb
office boy	Yes	No	No	No
employee	Yes	No	No	No

As nouns, employee is a hypernym of office boy; that is, employee is a word with a broader meaning than office boy:

office boy (noun)	employee (noun)
a young man who is employed to do odd jobs in a business office	a worker who is hired to perform a job