"Now may the God of peace Himself sanctify you completely, and may your whole spirit, soul, and body be preserved blameless at the coming of our Lord Jesus Christ." (1 Thessalonians 5:23)
Spirit - pneuma, soul - psyche (mind), body - soma.
Three different Greek words with three different meanings.
Yes, that is right.
Three different words used to describe three different things.
Well, God's word is perfectly precise in how God stated truth, for God is perfect and is the perfect communicator.
So we must study how God communicates his himself in his logos, his message to us. He communicates in sundry manners but most notably His logos is by the written word, the logos in writing and within the written word by the life of Jesus Christ, the logos, the message in the flesh.
More specifically we must understand that our "knowledge" does not exclude God from using figures of speech or using words according to His wisdom and knowledge and understanding and His decision of what and how to communicate truths.
In Psalm 18:2 we see God describing himself as a rock (fortress) a buckler, a horn, a high tower. Is God literally these things? Nope.
Jesus Christ is referred to as the chief corner stone. Is Jesus Christ literally a rock, granite or whatever, that was used to build a physical building or is that a figure of speech?
We are called living stones, what does that mean?
God uses the phrase "spirit of man" referring to soul in 1 Corinthians 2:11
For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.
God refers to soul as "spirit of man" for soul is spiritual but it is not the gift of holy spirit from the Holy Spirit. Soul is not the gift from the Holy Spirit. I John 4:13, which God gave, soul is not eternal life spirit, which is holy and cannot sin. Soul can sin and does sin, hence the need for a lord and savior and redeemer.
Maybe that will clarify this for you.