The missing letter is "a," forming the sequence "c, r, a, b," which spells "crab." This sequence follows an alphabetical pattern by skipping one letter between each.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -B-C-R-R-. That is, nine letter words with 2nd letter B and 4th letter C and 6th letter R and 8th letter R. In alphabetical order, they are: obscurers
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern R-C-B-R-. That is, eight letter words with 1st letter R and 3rd letter C and 5th letter B and 7th letter R. In alphabetical order, they are: ricebird
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern C-R-C--B. That is, eight letter words with 1st letter C and 3rd letter R and 5th letter C and 8th letter B. In alphabetical order, they are: corncrib
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern C--R-C--B. That is, nine letter words with 1st letter C and 4th letter R and 6th letter C and 9th letter B. In alphabetical order, they are: currycomb
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern B-R-B--C-. That is, nine letter words with 1st letter B and 3rd letter R and 5th letter B and 8th letter C. In alphabetical order, they are: barmbrack barnbrack
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According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern C-R-BR-C. That is, eight letter words with 1st letter C and 3rd letter R and 5th letter B and 6th letter R and 8th letter C. In alphabetical order, they are: cerebric
CRC CBO and COL
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -R--B-C. That is, seven letter words with 2nd letter R and 5th letter B and 7th letter C. In alphabetical order, they are: crombec
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern B----C-R. That is, eight letter words with 1st letter B and 6th letter C and 8th letter R. In alphabetical order, they are: balancer
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern C-R---B--. That is, nine letter words with 1st letter C and 3rd letter R and 7th letter B. In alphabetical order, they are: carnaubas carpetbag
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern R---B---C. That is, nine letter words with 1st letter R and 5th letter B and 9th letter C. In alphabetical order, they are: rheobasic