So, we can conclude that the word good may be used in sentences with different interpretation. The problem is compounded when we look at other phrases containing good. A good studentdescribes either someone who behaves well, or even someone who works haphazardly but shows a high level of ability. Then in other sentence containing good is A good film. This sentence can either means one which gives enjoyment or one which is thought to be of lasting value. What has to be decided is whether the meaning of good is homogeneous and neutral between all these different specifications, or whether good has different meanings according to its use in describing different things. In more general terms, this presents an example of the difficulty of distinguishing ambiguity from lack of specification or vagueness.
Ambiguity could be meant that both words and sentences can have more than one meaning, and the semantic rules a linguist sets up must state correctly for each language which words and sentences have more than one meaning. A little problem in deciding of a given sentence whether or not it is ambiguous is count as ambiguity. There are many cases where it is not at all clear whether the word, phrase or sentence in question is ambiguous or not.
For Instance: She has good legs.
Take the word good .Is it ambiguous? This sentence can either mean that she has healthy legs (no varicose veins, no broken or badly mended bones, no weak ankles, etc), or it can mean that she has beautiful legs, or it can mean that she has legs which function well (as an athlete’s, or a gymnast’s and etc).