Containing "dash" as a complete word:
* Dash (verb: to move quickly or suddenly)
* Dash (noun: a short, quick run)
* Dash (noun: a punctuation mark)
* Dash (noun: a small amount of something)
* Dashing (adjective: stylish or attractive)
* Dashboard (noun: a control panel in a vehicle)
Containing "dash" as part of a word:
* Crashland
* Firebrand
* Flashband
* Grassland
* Headland
* Highland
* Island
* Landward
* Mainland
* Midland
* Overland
* Plankland
* Scandinavian
* Seaboard
* Shoreland
* Skyland
* Soundland
* Splashdown
* Standish
* Starboard
* Sunland
* Woodland
Note: There are likely many more words with "dash" in them, depending on your definition of "contain" and the level of formality you're looking for. This list provides some common examples.