Something that exists and can be seen, felt, tasted, etc., especially something unusual or interesting plural: phenomena “The northern lights are an atmospheric .....'
Phenomenon
System of ideas intended to explain something, especially one based on general principles
Theory
Found in, or produced by the sea
Marine
A biological community of interacting organisms and their physical environment
Ecosystem
To give support or relief to / To supply with sustenance
Sustain
a public procession, especially one celebrating a special day or event and including marching bands and floats
Parade
a pipe usually in the street that provides water especially for putting out fires
Fire hydrant
a marked part of a road where pedestrians have right of way to cross
Pedestrian crossing / crosswalk
the hard surface of a road or street
Pavement / Sidewalk
a large outdoor board for displaying advertisements
Billboard
