"certificates" in the noun sense
1. certificate, certification, credential, credentials
a document attesting to the truth of certain stated facts
2. security, certificate
a formal declaration that documents a fact of relevance to finance and investment the holder has a right to receive interest or dividends
"he held several valuable securities"
"certificates" in the verb sense
present someone with a certificate
authorize by certificate
Source: WordNet® (An amazing lexical database of English)
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