Word
'Word,' as in Isaiah 9:8, signifies the doctrine of internal and external worship. 'Word,' as in Psalms 119:6-17, stands for doctrine in general.
'The Word,' as in Psalms 147:18, signifies divine good united with divine truth.
The whole Word is nothing but the doctrine of love towards the Lord, and love towards our neighbor, as in Matthew 22.
(Reference: Arcana Coelestia 1288)
Keep
Keeping" in the Bible generally concerns the actions of life, though in some cases it can mean holding something away from the activities of life to safeguard it. By far the most common use of "keep" is connected with keeping the Lord's commandments or keeping feast days or rituals. These all mean putting true ideas from the Lord into action in life; simply knowing them or remembering them is not enough. In a deeper sense, it means worshiping the Lord, since living life according to His leading is the ultimate act of worship. When its not possible to act from the Lord's commandments, "keeping" represents remembering and safeguarding those true ideas so that they can be put into practice eventually.
