1. North American subspecies of tundra swan having a soft whistling note
   - whistling swan

Type of: Cygnus columbianus, tundra swan

• hymenopterous
• hymenopterous insect
• Hymenoxys acaulis
• Hymenoxys grandiflora
• hymie
• hymn
• hymnal
• hymnary
• hymnbook
• hymnody
• hymnology
• Hynerpeton
• Hynerpeton bassetti
• hyoid
• hyoid bone
• hyoscine
• hyoscyamine
• Hyoscyamus
• Hyoscyamus muticus
• Hyoscyamus niger
• hyp
• hypaethral
• hypallage
• hypanthium
• Hypatia