"To je" and "to jsou" is a phrase to identify objects/people/even something imaginary like information. If you did not use "to", but only said Jsou slova., it would mean they exist.
To jsou ta slova. would require definite article in English, so you would mean some specific words known from previous context. Those are the words.
For the two phrases gender of nouns does not matter. You only use je/jsou depending if the noun is in sg or plural.