Air plant and Old man's beard

Air plant noun - Plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it.

Old man's beard and air plant are semantically related. In some cases you can replace phrase "Old man's beard" with "Air plant", this phrases are similar.

Old man's beard noun - Dense festoons of greenish-grey hairlike flexuous strands anchored to tree trunks and branches by sparse wiry roots; southeastern United States and West Indies to South America.

Air plant and old man's beard are semantically related. You can use "Air plant" instead a noun phrase "Old man's beard".