Voluntary Service Overseas 
(abbreviation VSO)
A British charitable organization founded in 1958 to promote voluntary work in developing countries.
- helianthemum
- helianthus
- helical
- helically
- helices
- helichrysum
- helicity
- Helicobacter
- helicoid
- helicoidal
- helicon
- heliconia
- Helicon, Mount
- helicopter
- helicopter muster
- helicopter parent
- helicopter parenting
- helicopter patrol
- helicopter pilot
- helicopter rescue
- helicopter station
- helicopter view
- helictite
- Heligoland
- helimustering