Answer: ok um I think its curiosity if its not forgive me
Explanation:
Certain
because disappointed isn’t as related to perplexed so it won’t make sense.
Answer:
A collection of . . . from around the world ➡ encyclopedia
information stored in databased and on sites ➡ online search engine
definitions, pronunciations, and spelling of words ➡ dictionary
words with similar meanings listed together ➡ thesaurus