Some words have multiple signs to express the level of that word.
For instance, the word laugh has a few... to represent a small chuckle, a giggle, a laugh, a louder laugh, and a hilarious 'LOL' laugh.
The same goes for multiple words for one sign. That's where the problem sometimes happens because some deaf people who are vocabulary-limited will misunderstand one sign for another. I've had to help a few people with that. One guy knew grammar enough to know when a sign didn't make sense. So, he would ask me... "Hey, someone said... 'Blah blah blah BLAH blah blah.' When he said that 'BLAH', I know it as this word but it doesn't make sense in that sentence. What does that sign also mean?"
