Consonant Cluster - English

English

In English, the longest possible initial cluster is three consonants, as in split /ˈsplɪt/ and strudel /ˈʃtruːdəl/, all beginning with /s/ or /ʃ/ and ending with /l/ or /r/; the longest possible final cluster is five consonants, as in angsts /ˈæŋksts/, though that is rare and four, as in twelfths /ˈtwɛlfθs/, sixths /ˈsɪksθs/, bursts /ˈbɜrsts/ and glimpsed /ˈɡlɪmpst/, is more common. In compound words, longer clusters are possible, as in handspring /ˈhændspriŋ/.

However, it is important to distinguish clusters and digraphs. Clusters are made of two or more consonant sounds, while a digraph is a group of two consonant letters standing for a single sound. For example, in the word ship, the two letters of the digraph ⟨sh⟩ together represent the single consonant . Also note a combination digraph and cluster as seen in length with two digraphs ⟨ng⟩, ⟨th⟩ representing a cluster of two consonants: /ŋθ/; lights with a silent digraph ⟨gh⟩ followed by a cluster ⟨t⟩, ⟨s⟩: /ts/; and compound words such as sightscreen /ˈsaɪtskriːn/ or catchphrase /ˈkætʃfreɪz/.