climax vs tail end

climax

• The final term of a rhetorical climax. 

• A rhetorical device in which a series is arranged in ascending order. 

• The culmination of sexual pleasure, an orgasm. 

• A culmination or acme: the last term in an ascending series 

• The culmination of a narrative's rising action, the turning point. 

• The culmination of ecological development, whereby species are in equilibrium with their environment. 

• To reach or bring to a climax (in any sense). 

tail end

• The last part of a period of time, event, or situation; the concluding or final part. 

• The hindmost part of anything (a person, animal, or object), the rear end; the butt, buttocks; hindquarters, rump.