Crossword puzzle clue "squirrels' haunts"

OAK, a hardwood tree

AERIE, the nest of a bird of prey, also EYRIE, EYRY

a genus of lily native to South Africa

ALLEY, a narrow passageway, also ALLEYWAY

a set of arches and their supporting columns; a covered and sometimes arched passageway, usually with shops on one or both sides

ARCADE, to furnish with an arcade

CAVE, to hollow out