This is from Biblestudy.org
Q. What is the difference between praise and worship?
A. First, let's look at the dictionary definition of worship and praise. The following is from the New Illustrated Webster's Dictionary (c.1992):
Worship - 1.The act or feeling of adoration or homage; the paying of religious reverence, as in prayer, praise, etc. 2. The act or feeling of deference, respect, or honor toward virtue, power, or the like. 3. Excessive or ardent admiration; also, the object of such love or admiration. 4. A title of honor in addressing persons of station.
Praise - verb: 1. To express approval and commendation of; applaud, eulogize. 2. To express adoration of; glorify (God, etc).
noun: 1.Commendation expressed, as of a person for his virtues, or concerning meritorious actions; utterance of approval; honor given; also, applause. 2. Thanksgiving for blessings conferred; laudation to God; worship expressed in song. 3. The object, ground, reason, or subject of praise.
By comparing the two definitions, we can first see that praise is part of our worship of Almighty God. We express our approval, thankfulness, and respect for Almighty God by offering praises to Him. Praises then become part of our worship of the Great God. Worship involves more than praise. In our worship of God, we show our love through obeying His commandments, living the way of life He has revealed through His written word, the Bible, communicating with Him in prayer, meeting and fellowshipping with other believers, and in offering praises to Him.