Synonyms are used to improve sentences. For example,
The happy cat jumped around the house.
The ecstatic cat jumped around the house.
useful, striking, producing, active, capable, competent, effectual, efficient, energetic, impressive, operative, powerful
A synonym for changable is adaptable.
A synonym for common noun is word.
A synonym for debris is garbage. An antonym for debris is cleanliness.
detector or metal detectors
Utile.
Otiose is a single word synonym for serving no useful purpose.
Practical, useful, utilitarian.
Beneficial
Fuuuck it
realistic, systematic, practicable, operative, possible, factual, useful
valuable, useful, advantageous, profitable, helpful, favorable, gainful, salutary, worthy
suitable, fit, handy, satisfactory, useful, practical, labour-saving, accessible, nearby
The synonym for help would be; Aid, assist, assistance, comfort, hand, support.
2 + 2 is a racisum, because it is a simple sum that can be calculated racily. A useful synonym is simplisum. - Geoff
useful, striking, producing, active, capable, competent, effectual, efficient, energetic, impressive, operative, powerful
valuable : of great worth, costly; cherished, dear, importantuseful : : functional, practical, applicable