Terms terms terms

Not exactly. Such is the subtlety of the English language, that words can have similar but not quite the same meaning.

Enharmonic just means frequencies that are not harmonically related. They need not necessarily be dissonant (think church bells). Atonal means no identifiable pitch (think wood blocks), so it qualifies as enharmonic but probably not dissonant.

bitflipper

Atonal means no identifiable pitch (think wood blocks), so it qualifies as enharmonic but probably not dissonant.
 
 

Have to take issue with this answer, bit.  I believe "atonal" means no identifiable key, but (non-percussion) instruments playing atonal music usually are very much tuned to the conventional well-tempered western tuning we've been using for the last couple of centuries.