Hello, a word "nego" is getting filtered by better chat "****" I have tried to install BetterChatFilter and whitelist "nego" but it still gets filtered.

Where is this located? 
"The key is the name/description of the setting while the value is the actual value you want to set it to. For example, to enable the word filter, you see under/inside "Word Filter" { ... } there is "Enabled": false. To enable it, you change it to "Enabled": true."