Y'know, the keyword 'keyword' doesn't come up in the SRD, at all. But, yeah, there's a 'charmed' condition, FWIW.The charm keyword doesn't come up at all (as in, not even once) in the spell write up for Tasha's Hideous Laughter. So it's not a charm spell. Done.
As Jack mentions, above, there's no 'charmed' condition involved, so not unless you rule that it should be.Since a ghost is immune to charm, is immune to Hideous laughter?
You could review any Enchantment spell and make a ruling as to whether the monster in question was immune. Ask yourself why the ghost is immune to Charm? Is it because it no longer has emotions? Because it has only negative emotions? Because it's malevolence makes it impossible for it to regard anyone like a friend? Because it isn't really aware, just endlessly re-playing the past?And what other spells would be consider charm spells?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.