What two words of the hymn, "How Great Thou Art," were changed from the original for inclusion in the LDS hymnbook?
Here's answer to week's question
The word "works" was changed to "worlds" in the portion of the first verse that reads, "Consider all the worlds thy hands have made."
In the next line of that same verse, the word "mighty" was changed to "rolling": "I see the stars, I hear the rolling thunder."
Source: Hymns, page 86.