#3509 νέφος nephos {nef'-os}

 apparently a root word; TDNT - 4:902,628; n n

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) a cloud, a large dense multitude, a throng
    1a) used to denote a great shapeless collection of vapour obscuring
        the heavens as opposed to a particular and definite masses of
        vapour with some form or shape
    1b) a cloud in the sky

 For Synonyms see entry G5866

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - cloud 1; 1

—Exhaustive Concordance (KJV Translation Frequency & Location)