semantic expansion or browsing

[graybeal]

Is your feature request related to a problem? If so please describe.
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Users don't know the 'right' words to find what they want.

Describe the solution you'd like
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Some combination of:

• Expand user-typed requests to other similar terms that are used in the DC.
• Support broader/narrower choices.
• Offer navigation through related semantic concepts
• Structure the existing Statistical Variable semantics to be more navigable

Describe alternatives you've considered
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A separate 'semantic assistant' that would let the user explore the semantic mappings outside of the Wizard.

Additional context
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Some of this is a bit researchy, but leverages the insights we have from BioPortal and our other recent proposals. The more advanced capabilities could get the Visionary tag.