* "Many" is a quantifier, indicating a large amount, rather than a quality.
* "Words" is the noun being collected.
To create an adjective from this sentence, you would need to add information about the type of words Donovan collects. For example:
* Donovan collects *rare* words. ("rare" is the adjective describing the words)
* Donovan collects *ancient* words. ("ancient" is the adjective describing the words)
* Donovan collects *funny* words. ("funny" is the adjective describing the words)