Terra is ground. And Gaia is mother earth. I have seen both used.
habeo amicum
Nympha, generally. A wood-elf is dryas; a water-elf is naias; in the field, it is faunus.
"Tu et me."
aevitas, aevitatis, aetas, aetatis, etas, etatis, aera, or aerae, depending upon context and tense.
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