The Academy of the Hebrew Language is the official body that decides what new words will be added to Hebrew, yet more than not, its decisions are not followed. For example, the word shokoladai means chocolatier, but no one ever uses it.
Hebrew words are based on a three-letter root word, yet many non-Hebrew words are now part of the language, especially in the last 100 years. The word for car, for example, is mechonit, but speakers also call it an auto.
Other Hebrew words are now part of the English language as well, and the bible is a large part of that influence. Many words from it demonstrate this, for example, amen, mammon (money), satan, abracadabra, and hallelujah.