This is the correct spelling well done!
antibiotic
this is the root word!
antibiotics = 항생제 (hangsaengje)
Bacterium is the singular word.
the singular word it is salmon.
singular
The singular word for adenomata is adenoma.
Lance is singular.
singular of the word stitches is stitch.
The word dog is the singular form.
Yes, the word "document" is singular.
The word "hang" is singular.
The word 'Phenomenon' is singular.