Horace and Sappho were two of the most famous ancient Greek poets. Horace was a Roman poet who wrote during the time of Augustus, while Sappho was an Archaic Greek poet from the island of Lesbos. Both poets are known for their lyrical poetry, which often focused on themes of love and nature. The term 'odists' is used to refer to poets who write odes, which are lyrical poems that express strong emotion. Therefore, the crossword solution 'odists' is an appropriate term to describe Horace and Sappho.