Is it a clip? Is it a magazine? Nerf seems to have it wrong everytime! This page is more dedicated for all kinds of magazines Nerf has released over the years, but for if you want to know the difference between a magazine and a clip, here's a video about this topic from Coop772. I do not own the YouTube channel Coop772 nor do I have any connection with the owner of that channel.
Nerf does call 'Magazines' 'Clips' on their website and packaging, so you might get more search results with the word 'Clip'. Nerf magazines are magazines though, not clips. (Watch the video).
(Almost) All Nerf Magazines
Let's start with the standard N-Strike Elite style magazines.
Nerf 6-Round Magazine
Holds six Elite-style darts
Nerf 10-Round Banana Magazine
Holds 10 Elite-style darts, mag is curved
Nerf 10-Round magazine
Holds ten Elite-style darts
Nerf 12-Round Magazine
Holds twelve Elite-style darts
Nerf 18-Round Magazine
Holds 18 Elite-style darts
Now, let's look at the Drum-style magazine.
These magazines are shaped like a cilinder. These magazines can store more darts than stick-magazines, without being as long as a stick-mag. Drums are wider than normal stick-mags. Nerf Drums mostly stick out to the left side of the blaster, but there is a symmetrical drum available.
Nerf 18-Round Drum
Holds 18 Elite-style darts
Nerf 25-Round Drum
Holds 25 Elite-style darts
Nerf 50-Dart Drum
Holds 50 Elite-style darts. This drum has two circular dart-holders, instead of the standard one. This drum is sold only with the Elite Titan CS-50.
Nerf 35-Round Drum
Holds 35 Elite-style darts
Next up are the clear stick-magazines
Nerf 12-Round Clear Magazine
Holds 12 Elite-style darts
Nerf 18-Round Clear Magazine
Holds 18 Elite-style darts
Change the ammo, now we're at Mega dart magazines
Only compatible with Nerf Mega Darts, and only usable in Nerf Mega Blasters
Nerf Rival also uses magazines
Only compatible with Nerf Rival Rounds, only usable in Nerf Rival Blasters.
Nerf Rival 7-Round Magazine
Holds 7 Rival rounds
Nerf Rival 12-Round Magazine
Holds 12 Rival rounds
Nerf Rival Khaos 40-Round Magazine
Holds 40 Rival Rounds, sold and only compatible with the Rival Khaos