Abarim Publications' online Biblical Greek Dictionary
The feminine noun νυμφη (numphe), meaning bride, and the masculine noun νυμφιος (numphios), meaning bridegroom, ultimately derive from a widely attested proto-Indo-European root sneubh-, meaning to marry — to betroth in Slovak is zasnubit, to marry in Russian is zhenit'sya, and in Latin it's nupto, hence our English adjective "nuptial".
The feminine noun νυμφη (numphe), meaning bride, occurs in Matthew 10:35 and Luke 12:53 in the sense of daughter-in-law. Four times in Revelation our word denotes the people of God (18:23, 21:2, 21:9 and 22:17, also see John 3:29). The masculine noun νυμφιος (numphios), meaning bridegroom, occurs twelve times: Matthew 9:15, 25:1-10, Mark 2:19-20, Luke 5:34-35, John 2:9, 3:29 and Revelation 18:23.
The Bible also uses the noun νυμφων (numphon), meaning bridal chamber; the designated room of the house in which the marriage was to be consummated. This word occurs in the phrase "sons of the numphon", which refers to attendants of the groom. Jesus refers to His disciples as his "sons of the numphon" (Matthew 9:15, Mark 2:19, Luke 5:34). The bride also had her attendants, but they are not mentioned in the New Testament.