We do say “less than, greater than” but other than adding “even” we don’t really change “more” to fit the noun. Is there more people than yesterday? “Those are both comparisons. If you didn’t want to compare and if you didn’t want to use the word “more”, you could potentially say “We have a great number of people. That one could be confusing though because it could be any number that your personal opinion deems as good relative to a large number; so in that case it might be better to say “we have a lot of people” or “We have many people…”