Dictionary words are always a bad idea, even though you are correct that length does always make a password stronger.
Not necessarily. Four obscure words joined together may be beyond the length of what many popular cracking tools support, and of relatively high strength. Assuming each word is only found in 100k+ dictionaries, there are 100000000000000000000 possibilities.
If such passwords are not strong enough, you really need to reconsider how much of your life should be tied to computers.