Speck
Part of speech: noun
Definition: A tiny spot, especially of dirt etc.
Example sentence: I'm just one tiny speck on this earth and I am always mindful of the fact that other people have rights and interests.
Pinpoint
Part of speech: adjective
Definition: Extremely precise or specific, especially regarding location.
Part of speech: verb
Definition: To identify or locate precisely or with great accuracy.
Part of speech: noun
Definition: The point of a pin
Example sentence: People forget that although we can pinpoint the price, we can only guess at future earnings. The past isn't much help: It simply tells whether a market was pricey or cheap.