Hand-held computer and Portable computer

Hand-held computer noun - A portable battery-powered computer small enough to be carried in your pocket.

Portable computer and hand-held computer are semantically related. In some cases you can use "Portable computer" instead a noun phrase "Hand-held computer".

Portable computer noun - A personal computer that can easily be carried by hand.

Hand-held computer and portable computer are semantically related. Sometimes you can replace phrase "Hand-held computer" with "Portable computer", this phrases are similar.