It depends on what sentence it is going in. I think that "all" might work for you.
whole, all, every
Daily
One could use the word always.
Every one third of a year.
The dictionary.
Doggedly, relentlessly, constantly, invariably
frequently, regularly, periodically, every month, cyclically
bi weekly
The word "synonym" means that the word means the same as another word. Almost every word in the language has some word that it's the same as.
Just about every reaction in our bodies is regulated by an enzyme. The word enzyme is just another word for catalyst.
Every language includes a word for seven. A group of seven is a septet, but I do not think any English word would be another name for seven.
No. A population is every organism living in a particular area.