There are several such services out there. Just Google "keyword suggestion tool." My favorite is:
http://freekeywords.wordtracker.com/
I type in a word related to an area of interest and I receive back the number of recent searches for keyword phrases that include the word I typed in. For example (just using the top 5):
"car" got me:
| 54860 | play car racing games |
| 38257 | cars |
| 16560 | used cars |
| 14363 | play race car games |
| 11614 | car |
and "automobile" got me:
| 6033 | citizens automobile finance, inc |
| 1160 | citizens automobile finance, i |
| 763 | automobile insurance |
| 638 | automobiles |
| 630 | automobile |
...which demonstrates how different markets use different words for the same thing.
If you want to do some relevant homework, build lists of ALL the terms related to your business, and if you haven't got a business, build lists of ALL the terms related to ALL your interests and you might discover a business waiting to happen.
Warning: This is a boring chore and I don't expect you to actually do it. However, if you do you will be miles ahead of your competition because you did your homework. Otherwise, you can call us at New Earth Arts.
Next Installment: Checking out the competition