The hard c sound is often spelled with the letter "c" followed by vowels, such as "cat" or "cone." However, there are a variety of synonyms for this sound that can be used in different contexts. For example, the sound can also be spelled with the letter "k," as in the word "kangaroo." Another option is to use the letter combination "ck," as in the word "backpack." Additionally, words with the letter combination "ch" can sometimes make the hard c sound, such as in the word "church." Other synonym options for the hard c sound include using the letter "q," as in the word "quiche," or adding a silent "gh" to the end of a word, as in the word "laugh".