Anacin, BAYER, ACHE, ACHES, UNCAP, and PAIN are all brands of aspirin. ANACIN is a six-letter brand of aspirin that was first introduced in the early 1900s. BAYER is a five-letter brand of aspirin that was first developed by the German pharmaceutical company BAYER AG in the late 1800s. ACHE and ACHES are both four- and five-letter brands of aspirin, respectively. UNCAP is a five-letter brand of aspirin that is marketed as a PAIN reliever. Lastly, PAIN is a four-letter brand of aspirin that is used to treat minor ACHES and pains.