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convent [convent 词源字典]: convent: [13] Latin conventus meant ‘assembly’ (it was the past participle of convenire ‘come together’, source of English convenient), but as it passed via Anglo-Norman covent into English it acquired the specialized sense ‘religious community’ (in early use it was applied to communities of either sex, but since the end of the 18th century it has come to be used exclusively for a ‘house of nuns’).

Until the mid- 15th century the Anglo-Norman spelling covent was retained in English (it survives in Covent Garden, which was formerly a vegetable garden belonging to the monks of Westminster Abbey, and may also the the source of coven [16]).
=> convenient, coven, venue[convent etymology, convent origin, 英语词源]
orchard: orchard: [OE] Etymologically, an orchard is probably simply a ‘plant-yard’. It appears to have been coined in the prehistoric Germanic period from *worti-, the ancestor of the now archaic English noun wort ‘plant, vegetable, herb’ (which is distantly related to root), and *gardaz, *gardon, forerunner of English yard and garden. Originally, as its derivation suggests, it was quite a broad term, covering vegetable gardens as well as enclosures for fruit trees, but by the 15th century it had more or less become restricted to the latter.
=> garden, yard
orchard (n.): late Old English orceard "fruit garden," earlier ortgeard, perhaps reduced from wortgeard, from wort (Old English wyrt "vegetable, plant root") + geard "garden, yard" (the word also meant "vegetable garden" until 15c.); see yard (n.1). First element influenced in Middle English by Latin hortus (in Late Latin ortus) "garden," which also is from the root of yard (n.1).