The suffix -ery is a noun-forming suffix. But what about the word "slippery"? Here the word is an adjective!
Are there any other words that are adjectives with this suffix?
I have checked some dictionaries! and several online sites. Would you please give me some examples of adjectives?
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Also note that -ery is often actually two suffixes if you're doing a morphological analysis.
bake -> baker -> bakery. -er and -y are suffixes.
"The suffix first occurs in loans from Old French into Middle English, but becomes productive within English by the 16th century, in some instances properly a combination of -er with
-y as in bakery, brewery, but also as a single suffix in terms like slavery, machinery."
-ery - Wiktionary
Also, just because -ery can be a noun-forming suffix, which I wouldn't contest, that doesn't mean it's always a noun-forming suffix, or even as I've said, one suffix at all.
Adjectives ending -ery:
flowery, blustery, feathery, coppery, buttery...to name but a few.
These words that you have provided are not the ones I need because "flowery" is "flower+-y" and not "flower+-ery"!!!! This also applies to the other words!
-ery | Define -ery at Dictionary.com
-ery - definition of -ery by the Free Online Dictionary, Thesaurus and Encyclopedia.
Also if you look at Longman or Collins dictionaries, they also say that "-ery" is a noun-making suffix!!!!