Crawl space and Underpass

Crawl space noun - Low space beneath a floor of a building; gives workers access to wiring or plumbing.

Underpass and crawl space are semantically related in covered passageway topic. In some cases you can use "Underpass" instead a noun phrase "Crawl space".

Underpass noun - An underground tunnel or passage enabling pedestrians to cross a road or railway.

Crawl space and underpass are semantically related in covered passageway topic. You can use "Crawl space" instead a noun "Underpass".