| Word composition | http://edamontology.org/data_2157 | Word composition | |
| Word length | http://edamontology.org/data_1250 | Word size | |
| Word size | http://edamontology.org/data_1250 | Word size | |
| Workflow | http://edamontology.org/data_2972 | Workflow | |
| Workflow data | http://edamontology.org/data_2971 | Workflow data | |
| Workflow format | http://edamontology.org/format_2032 | Workflow format | |
| Workflow ID | http://edamontology.org/data_1083 | Workflow ID | |
| Workflow metadata | http://edamontology.org/data_0949 | Workflow metadata | |
| Workflows | http://edamontology.org/topic_0769 | Workflows | |
| WormBase class | http://edamontology.org/data_1092 | WormBase class | |
| WormBase gene report format | http://edamontology.org/format_1617 | WormBase gene report format | |
| WormBase identifier | http://edamontology.org/data_2113 | WormBase identifier | |
| WormBase name | http://edamontology.org/data_1091 | WormBase name | |
| WormBase wormpep ID | http://edamontology.org/data_2114 | WormBase wormpep ID | |
| Worms | http://edamontology.org/topic_0215 | Worms | |
| WTSS | http://edamontology.org/topic_3170 | RNA-Seq | |
| xbm | http://edamontology.org/format_3598 | xbm | |
| xgmml | http://edamontology.org/format_3618 | xgmml | |
| xls | http://edamontology.org/format_3468 | xls | |
| xlsx | http://edamontology.org/format_3620 | xlsx | |
| XML | http://edamontology.org/format_2332 | XML | |
| XML Schema | http://edamontology.org/data_2250 | XML Schema | |
| xpm | http://edamontology.org/format_3599 | xpm | |
| X-ray crystallography | http://edamontology.org/topic_2828 | X-ray diffraction | |
| X-ray diffraction | http://edamontology.org/topic_2828 | X-ray diffraction | |
| X-ray microscopy | http://edamontology.org/topic_2828 | X-ray diffraction | |
| X-ray tomography | http://edamontology.org/topic_3452 | Tomography | |
| XSD | http://edamontology.org/data_2250 | XML Schema | |
| XSLT stylesheet | http://edamontology.org/data_2252 | XSLT stylesheet | |
| X!Tandem XML | http://edamontology.org/format_3711 | X!Tandem XML | |