Pronunciation: [ɹˈʌnɪə] (IPA) 
"Runnier" is a comparative form of the adjective "runny," which means having a consistency similar to liquid or being prone to run or flow. The word is spelled with double "n" after the "u", because the "u" is pronounced with a short sound, similar to "uh" and the consonant that follows it signals a short vowel sound that comes before it. The IPA phonetic transcription of "runnier" is /ˈrʌn.i.ər/, where the dots indicate a syllable break.
The word runnier is formed by adding the suffix -ier to the word runny.
The term runny originated in the late 18th century, and it is derived from the verb run. The verb run has Old English roots, and its etymology can be traced back to the Proto-Germanic word rinnan, which means to flow. Over time, the adjective runny was formed to describe substances or materials that have a fluid or flowing consistency.
The suffix -ier is a comparative suffix added to adjectives to indicate a higher degree of the quality expressed in the base word. Therefore, by adding -ier to runny, we form runnier, which means more runny or having a higher degree of fluidity.
