thickness
nounHow wide or deep something is from one side to the other.
nounA measurement of how wide or deep something is.
nounOne sheet or level of something on top of other sheets or levels.
nounHow heavy or creamy something feels when you touch or taste it.
Syllables
2 syllables
Letters
Related words (same phonics pattern)
Phonics breakdown
Phonics Rule: TH Digraph (Unvoiced)
TH can make a soft sound /θ/, like in 'think' and 'bath'. Just air, no buzz!
The unvoiced TH /θ/ is the quiet, breathy version. Your throat doesn't vibrate. Stick your tongue between your teeth and blow air.
Tip
Unvoiced TH is quiet — think with three teeth!
Examples
Phonics Rule: Short I
The letter I makes a short sound, like in 'sit' and 'big'.
When the letter I appears in a closed syllable, it usually makes the short I sound /ɪ/. This is one of the trickiest short vowels because it sounds similar to short E.
Tip
I says /ɪ/ like an itch you can't miss.
Examples
Phonics Rule: CK Digraph
CK together makes the /k/ sound, like in 'back' and 'kick'.
The digraph 'ck' appears right after a short vowel at the end of a one-syllable word. If the vowel is short, use CK. If the vowel is long, use just K (like 'make').
Tip
Short vowel? CK comes quick — back, kick, duck!
Examples
Phonics Rule: Suffix -NESS
Adding -NESS turns a describing word into a thing, like 'happy' → 'happiness'.
The suffix -ness turns an adjective into a noun. It means 'the state of being [adjective]'. 'Happy' → 'happiness' = the state of being happy.
Examples
What is SnapPhonics?
A phonics reference for teachers, parents and learners. Every English word, broken into the sounds that make it — with audio, syllables, and the rule behind each spelling.
Save words to study lists, build flashcard decks, and scan your own worksheets and books.