etymology - What is the origin of the -th suffix? What is the . . . 2 th as suffix changes the verb or adjective to a noun - no dispute there What does making it a noun add to the meaning? It often seems to mean a state of: eg Strength - a state of strong Health as a state of healing, Width as a state of wide, etc
Is there any rule for differentiating between the endings th and ht? The ones ending in th all have the [θ] sound, which is formed by putting the tip of the tongue between the front teeth and blowing The ones ending in ht all have the [t] sound (or some allophonic variant thereof)