The word 
is not a valid scrabble word
1 short excerpt of WikWik.org (WikWik is an online database of words defined in the English, French, Spanish, Italian, and other Wiktionnaries.)
- Fourier␣cosine␣series n. A Fourier series consisting solely of cosine functions.
6 valid words from the definition
CONSISTING COSINE FUNCTIONS OF SERIES SOLELY
1 invalid word from the definition
21 words-in-word (Words found as is inside the word.)
COS COSINE COSINES ER ES FOU FOUR IN NE OS OU OUR OURIE OURIER SER SERIES SI SIN SINE SINES UR
16 words-in-word RTL (Words found written from right to left, inside the word.)
EN ES IRE IRES IS ISO NIS OF RE REI RES SEI SEIR SEN SO SOC
Scrabble scoring
- Zero, invalid.
- 24 points, without game rules.
Other languages
Categories without words
- No anagrams (Word found by changing the order of the letters.)
- No cousins (Word found by changing only one letter.)
- No lipograms (Word found when removing only one letter.)
- No epentheses (Word found when adding only one letter.)
- No suffixes (Word found by adding one or more letters at the end of the word.)
- Not found in the middle (Word found by adding letters in front and at the end of the word.)
- No prefixes (Word found by adding one or more letters in front of the word.)
- No anagrams can be formed with an extra letter (New word formed with all the letters of the word and an extra letter.)
- No anagrams can be formed by removing a letter (New word formed with all the letters of the word minus a letter.)
Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
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