What is another word for thick shells?
Pronunciation: [θˈɪk ʃˈɛlz] (IPA) 
The term "thick shells" is often used to refer to things that are durable and resistant to outside forces. When looking for synonyms for this phrase, one might consider options such as "sturdy exteriors," "robust coverings," or "hardy casings." Other possible synonyms might include "strong outer layers," "resilient coatings," or "tough defensive barriers." Depending on the context in which the phrase is used, other options could include "thick armor," "dense coatings," or "hardened surfaces." Ultimately, the best choice of synonym will depend on the specific application of the term and the intended message of the writer or speaker.
