holiness, a holy or consecrated thing
Note that the emphasis is on the first syllable. I will show all four forms, since each has some special spelling and pronunciation oddities.
קֳדָשִׁים, or קָדָשִׁים = masculine plural noun: koh-dah-SHEEM
Note that the first vowel remains “OH” sound. It is usually spelled with the chatef qamets, (hurried qamets) but also can be with the qamets chatoof. The First Hebrew Primer lists the qamets chatoof spelling, but I have found the other spelling in my Tanach.
-קֹדֶשׁ The smichoot singular form = the masculine singular above, kohdesh… the emphasis is just transferred to the end of the smichoot (the word that follows the kohdesh, as in "kohdesh eloHEEM": holiness of G-d).
קָדְשֵׁי khod-shey… The plural smichoot form also has the qamets chatoof (qamets snatched) spelling. Remember the “closed, unaccented syllable” rule? Also, because it is NOT qamets under the qof, it is NOT a long vowel, and the sheva under dalet is NOT voiced.
I know, this one became very technical. For those who would like to learn the song based on this word's adjective form: kaDOSH, "holy"
click here to view the youtube teaching for kaDOSH (beginner level)
Click here for yet another song: kaDOSH ahTAH (Holy are you)
This has translation and the Hebrew text with the video, which I like to see as I listen to the Hebrew.
Finally, there is keduSHAH קדשה which is a feminine form meaning: sanctification, holiness. It is also the name of a prayer (requiring a minyan) in which "holy, holy, holy" is pronounced.
Let me know if the links don't work, or if you have any questions at all.