The harp or the harpsichord

The harpsichord is a piano, the harp is a plucked string instrument.

Pianos are dynamic in play, harps tend to only have a single play style.

Harpguitars are the most interesting combination of stringed instruments I've ever known. Brilliance of Orville Gibson, and yes, the same Gibson that eventually became a household name in the electric guitar biz. Of course, Orville sold his business and likeness (that's Orville's signature on every headstock) to a pair of siblings back before it became a thriving business; he had passed on before such would come to pass.

Thanks Orville. 🤘

Yes they both have strings; but the harpsichord (also known as cembalo) is a keyboard instrument (like the piano), where the strings resonate as a result of impact by a small piece of wood, whereas the strings of a harp are plucked by a (usually female) hand.
[edit: user @uncalled4 kindly informed me that in a harpsichord the strings are set in vibration by plucking, and not by a mallet. ]

Forgive my ignorance all, I'm just a drummer 😂