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physical object > natural object > celestial body > collection of stars > star cluster > open cluster > Coma open cluster
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Coma open cluster comparison table
Subject is a kind of has number of star is an instance of has definition has distance
open clusterstar cluster  A comparatively loose grouping (mass range 102-103 M)sun of Population I stars, strongly concentrated in the spiral arms or the disk of the Galaxy (in fact, open clusters give a good indication of where the spiral arms are). Unlike associations, open clusters are dynamically stable. Depending on their age, stars in open clusters "peel off" from the main sequence at different points (the higher the turnoff point, the younger the cluster). (Sometimes called Galactic cluster; NGC 188 is the oldest known open cluster.) 
Coma open cluster 100open clusterOpen cluster similar to the Hyades in overall binary frequency.80 pc

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