1) Quality 2) Timber 3) Timbre 4) Tone 5) Twanginess 1) Twang 
[disorder] In normal speech, nasality is referred to as nasalization and is a linguistic category that can apply to vowels or consonants in a specific language. The primary underlying physical variable determining the degree of nasality in normal speech is the opening and closing of a velopharyngeal passageway between the oral vocal tract a...
• (n.) The quality or state of being nasal. • (n.) The quality or state of being nasal.
(from the article `speech disorder`) Increased nasal resonance leads to open nasality (hypernasal speech), affecting all oral speech sounds that should not be nasal. Organic causes ...
Na·sal'i·ty noun [ Confer French nasalité .] The quality or state of being nasal. 
[n] - a quality of the voice that is produced by nasal resonators
noun a quality of the voice that is produced by nasal resonators