i Register
In some senses, o'er is marked as literary. Watch for register when choosing this word.
ADJ.
clear, dead, fruitless, highest, long, main, near, roof-top
VERB + O'ER
beetling, frowned, give, ground, looking, passing, shone, wave
O'ER + NOUN
battlements, city, leagues, midmost, thy, town
ADV.
lightly