If you look at the source, their word list contains around 1600 words. That is just no where near enough. Using this would give you a very easy to crack password. You need to make up your own passwords with words you come up with.
1600 words is 10.6 bits per word. If you want to reach 70 bits (safe from offline attacks with custom hardware), that means you need 7 words, which is within most people's capacity to memorize. If you increase your wordlist to 65536 words, you can get 16 bits per word, but you have to include words like "lefeuvre", "aarau", and "aubagne". Then you can reach 70 bits in only 5 words. That's not worth it.
Inventing your own words is unlikely to produce very random words. You'll probably mostly invent the same few hundred nonsense words that any other speaker of your native language would invent.
In other words, you have no idea what you are talking about and should not have posted.
On what basis is that "very easy"? Four words from 1600 is 1600^4 permutations, which would take over 200 years to test at a 1000/second attack.
Sure, if we're talking about a different type of password, and 2-billion-tries-per-second attacks, it'll fall in about an hour, but simply pushing that out to six words from that dictionary will still stymie that level of attack for a couple of hundred years. The size of the dictionary is much less important than the length of phrase you generate from it.
