1) Articulate 2) Enounce 3) Enunciate 4) Express or utter with a hiss 5) Pronounce 6) Sound out 7) Ssspeak like thisss 8) To hiss 9) To speak with a hissing sound 10) Utter a sibilant 1) Assibilate 2) Hiss 3) Siss 4) Sizz 
• (v. t. & i.) To pronounce with a hissing sound, like that of the letter s; to mark with a character indicating such pronunciation.
Sib'i·late transitive verb & i. To pronounce with a hissing sound, like that of the letter s ; to mark with a character indicating such pronunciation. 
[v] - pronounce with an initial sibilant 2. [v] - utter a sibilant