Phoebum
Phoebum is a Latin form of Phoebus, meaning “Phoebus, Apollo; the sun”. It is the genitive plural masculine noun or accusative singular masculine noun.
Found 41 times in the Latin texts on Socratos.
Where it is used
Vergil, Eclogues 5.9: Quid, si idem certet Phoebum superare canendo?
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.