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comrade (n.)[comrade 词源字典]: 1590s, "one who shares the same room," from Middle French camarade (16c.), from Spanish camarada "chamber mate," originally "chamberful," from Latin camera (see camera). In Spanish, a collective noun referring to one's company. In 17c., sometimes jocularly misspelled comrogue. Related: Comradely; comradeship.[comrade etymology, comrade origin, 英语词源]
fellowship (n.): c. 1200, feolahschipe "companionship," from fellow + -ship. Sense of "a body of companions" is from late 13c. Meaning "spirit of comradeship, friendliness" is from late 14c. As a state of privilege in English colleges, from 1530s. In Middle English it was at times a euphemism for "sexual intercourse" (carnal fellowship).
To fellowship with is to hold communion with; to unite with in doctrine and discipline. This barbarism now appears with disgusting frequency in the reports of ecclesiastical conventions, and in the religious newspapers generally. [Bartlett, "Dictionary of Americanisms," 1848]
But Chaucer and Wyclif used it as a verb in Middle English, "to have fellowship with."