aerie / aery / airy / eyrie are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
aerie: (noun) the lofty nest of a bird of prey (such as a hawk or eagle). (noun) any habitation at a high altitude.
aery: NA
airy: (adjective) not practical or realizable; speculative. (adjective) having little or no perceptible weight; so light as to resemble air.
eyrie: NA
aerie: EH·r·iy
aery: NA
airy: EH·r·iy
eyrie: EH·r·iy
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)