| obligatory(adjective, sound, certain, true, significant) |
| necessary(adjective, sound, essential, inexorable, required) |
| fastening(noun, verb, lead, connection, tie) |
| band(noun, connection, tie, stretch, bow) |
| bond(noun, stay, lead, line, connection) |
| cover(noun, top, case, covering, book) |
| essential(adjective, significant, basic, vital, necessary) |
| tying(verb, adjective, fastening, restrictive, restraining) |
| compulsory(adjective, sound, certain, true, significant) |
| fastener(noun, tie, fastener, coupling) |
| inevitable(adjective, certain, expected, predictable, required) |
| mandatory(adjective, set, significant, affected, essential) |
| required(adjective, significant, essential, basic, vital) |
| restrictive |
| bandaging |
| confining(verb, adjective, severe, harsh, stiff) |
| imperative(adjective, significant, essential, basic, vital) |
| judgemental |
| knitting(noun, verb, fastener, fastening, sewing) |
| valid(adjective, sound, right, reasonable, severe) |