I. -er 1 /ə $ ər/ BrE AmE suffix
forms the comparative of many short adjectives and adverbs:
hot, hotter
dry, drier
fast, faster
⇨ ↑ -est
II. -er 2 BrE AmE suffix [in nouns]
1 . someone who does something or is doing something:
a dancer
a driver
2 . something that does something:
a scraper (=a tool you use for scraping)
⇨ ↑ -ar , ↑ -or