The Son of God is a particular title used of Christ. Like all titles it displays one aspect of his character or nature. Though titles MAY sound like they are contradictory, we separate and rejoin the ideas so the we understand them better, like the vav ו.

The 'Son of God' stands in contrast to the 'Son of Man'. If these titles are taken as redundancies or equal aliases for Christ, then we don't learn anything.

The Son of God speaks of his divine nature, and the Son of Man speaks of his human nature. These are two sides of his one nature. he was not half and half as some would have him, though we can reference his divinity or his humanity separately, as we wish to know him intimately.

God

In Hebrew the 'Son of God' is the 'bar elohin' אלהין. Elohin is a name of God which differs from Elohim only by the last letter.

'Elohim' אלהום represents God 'el' separated from his people (waters 'im' ום meaning creation ו completed in the works of the son ם.) by not understanding ה.

'Elohin' אלהון means "God separated from 'his' ין, as in those who are his, by not understanding ה." Here , 'ין' is 'his' as creation י finished by the Son of Man who died ן.