To loop over a set of words, issuing a command for each word do:
for i in stop start; do service tomcat7 $i; done
This issues the command 'service tomcat7' with the paramters 'stop' and then 'start'. You set the word 'stop' to the paramater $i, and 'start' in the next iteration.
If you're doing it all on one line you need a semi-colon after the final word, 'start' in this instance. And you need 'do' before the actual command.
And you need a semi-colon after the command. And finally 'done'.
This works in both bash and zsh.