We don't have synonyms for kailan yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are kalan, kaplan and kailas.
(n) :
Brassica oleracea var. alboglabra, a long, blue-green vegetable with thick, glossy stems and leaves typically eaten in Chinese and particularly Cantonese cooking.
(n) :
Brassica oleracea var. alboglabra, a long, blue-green vegetable with thick, glossy stems and leaves typically eaten in Chinese and particularly Cantonese cooking.