Thayer's Greek Lexicon

 1. a son
  1) rarely used for the young of animals
  2) generally used of the offspring of men
  3) in a restricted sense, the male offspring (one born by a father
and of a mother)
  4) in a wider sense, a descendant, one of the posterity of any one,
1d1. the children of Israel
1d2. sons of Abraham
  5)) used to describe one who depends on another or is his follower
1e1. a pupil
2. son of man
  1) term describing man, carrying the connotation of weakness and
mortality
  2) son of man, symbolically denotes the fifth kingdom in Daniel 7:13
and by this term its humanity is indicated in contrast with the
barbarity and ferocity of the four preceding kingdoms (the
Babylonian, the Median and the Persian, the Macedonian, and the
Roman) typified by the four beasts. In the book of Enoch (2nd
Century) it is used of Christ.
  3) used by Christ himself, doubtless in order that he might
intimate his Messiahship and also that he might designate
himself as the head of the human race, the man, the one who
both furnished the pattern of the perfect man and acted on
behalf of all mankind. Christ seems to have preferred this to
the other Messianic titles, because by its lowliness it was
least suited to foster the expectation of an earthly Messiah
in royal splendour.
3. son of God
  1) used to describe Adam (Lk. 3:38.
  2) used to describe those who are born again (Lk. 20:36. and of
angels and of Jesus Christ
  3) of those whom God esteems as sons, whom he loves, protects and
benefits above others
3c1. in the OT used of the Jews
3c2. in the NT of Christians
3c3. those whose character God, as a loving father, shapes by
chastisements (Heb. 12:5-8.
  4) those who revere God as their father, the pious worshippers of
God, those who in character and life resemble God, those who
are governed by the Spirit of God, repose the same calm and
joyful trust in God which children do in their parents (Rom.
8:14, Gal. 3:26 ), and hereafter in the blessedness and glory
of the life eternal will openly wear this dignity of the sons
of God. Term used preeminently of Jesus Christ, as enjoying
the supreme love of God, united to him in affectionate
intimacy, privy to his saving councils, obedient to the
Father's will in all his acts

For Synonyms see entry G5868