How these differ from the themed sheets
A themed word search (animals, space, Halloween) is a vocabulary exposure activity. It puts words in front of a child and asks them to scan. That is useful, and it is most of what this site does.
The worksheet sets are narrower on purpose. A sheet of CVC words contains only consonant-vowel-consonant words, so a child who is decoding CAT andHAT in the same grid is practicing one pattern repeatedly instead of meeting twelve unrelated words. A compound words sheet lets a student seeSUNSHINE and SUNFLOWER next to each other, which is the actual point of the lesson.
A note on two-letter words
Kindergarten sight word lists are full of two-letter words: is, it, in, my, go, we. You will not find them on these sheets, and that is deliberate rather than an oversight.
In a grid of random letters, any two-letter sequence occurs by chance many times over. A child hunting for it will find it in a dozen places, none of them the intended one. The exercise stops teaching anything. The sight word sets here use the three-letter-and-longer portion of the standard lists, which works properly in this format.
Standards
Some sets reference a Common Core code to help you find the right sheet quickly. Each code shown has been checked against the published standard, and sets where we were not certain carry no code at all rather than a guess.
Those references are navigational aids and nothing more. WordSearchCraft is not affiliated with, endorsed by, or connected to the organizations that publish those standards. The public documents are used as a reference, the same way any teacher would use them.