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.
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.