(BE7) Wrote an email to my main English teacher today. Part of it said:
"When we teach students to find the meaning of a word, one of the first things they should do is ask "what part of speech" (POS) is it? It is not rare for these words "dog", "hound", "bug" to be used as nouns, but they are just as valid as verbs."

After providing those three examples it seemed a better list could be found on the web. So did a quick search for and hit this other Blogspot entry:
http://thyeoh07.blogspot.com/2008/03/words-that-act-as-nouns-and-verbs.html

That link provided some great explanations. It started out with:
"Words that act as nouns and verbs

There are words in English that belong to two Parts of Speech, that is nouns and verbs. By the way, Parts of Speech refer to eight categories of words, namely nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions and interjections.

Examples of such words are as follows:

Example 1: race

The race will be held tomorrow. [noun]

My race is Chinese.[noun]

They usually race to the bus station so as not to miss the bus.[verb]

Example 2: shower

I had a shower when I reached home.

[noun]
Modern parents usually shower their children with love. [verb]"...

So, always keep searching... and don't forget to share what you've learned.