"mp3 player": technically true, most popular and recognizable, but this device plays a lot more than just mp3s, hides that there's better codecs these days

"FLAC player": better, but many of the same problems, has audiophile connotations

"iPod": genericizing trademarks is cool, but confusing since the device is not literally an ipod

"Sansa Clip+": sandisk's not gonna fuck you, bro

"Digital Audio Player": the actual name for the class of device, but makes you sound like an alien. beep blorp take me to your digital audio player, human

"DAP": hope you like explaining acronyms, buddy