laptop vs laptop computer

laptop and laptop computer both are nouns.

Word	Noun	Adjective	Verb	Adverb
laptop	Yes	No	No	No
laptop computer	Yes	No	No	No

As nouns, laptop and laptop computer are synonyms defined as:

laptop and laptop computer: a portable computer small enough to use in your lap

laptop (noun)	laptop computer (noun)
a portable computer small enough to use in your lap	a portable computer small enough to use in your lap