If you want the dictionary definition, just double click on any word.
travel
trip
voyage
journey

Travel (v) is used in general terms as a verb - it usually means to change location. The word travel is very rarely used as a noun.

For example: I have to travel a lot for work.

Trip (n) is often substituted for the word holiday when the travelling distance was short.

For example: How was your trip?

It is often used in connection with business.

For example: I have to travel a lot for work. I am off on another business trip next week.

Trip (v) has a totally different meaning. It means to nearly fall over.

For example: I tripped over the carpet and sprained my ankle.

Voyage (n) is usually a long journey by boat. The word voyage is very rarely used as a verb.

For example: The voyage to South Africa took over six weeks.

Journey (n) is used more in British English (BrE) than American English (AmE). It means the 'piece' of travel between 2 or more points. The word journey is very rarely used as a verb.

For example: The journey from Darmstadt to Nottingham takes 12 hours.