The term "thick-billed" is usually used to describe birds with a strong and robust beak. There are several words and phrases that can be used as synonyms to this term, such as heavy-beaked, strong-jawed, stout-billed, and bulky-billed. These adjectives all suggest a solid and powerful beak that is adapted for various functions, including cracking seeds and drilling into wood. Other related words include sturdy-billed, massive-billed, and large-billed, which all imply a similar morphology. Overall, these synonyms provide diverse ways to describe the beak shape of birds, highlighting their unique and functional adaptations to their environment.