There are 16 words that start with 'ribo'.
| ribose | riboses |
| ribosome | ribozyme |
| ribosomal | ribosomes |
| ribozymal | ribozymes |
| riboflavin | riboflavins |
| ribonuclease | ribonucleases |
| ribonucleoside | ribonucleotide |
| ribonucleosides | ribonucleotides |
Note: These 16 words that start with 'ribo' are found from the USA & Canada version of the tournament Scrabble word list.