No. Echoes are a type of clone.
Clone is still an official term. Echoes are effectively upgraded costumes by design. Clones simply use the character as a base, heavily based upon their skeleton, but not their proportions specifically. Isabelle is a semi-clone because she uses Villager as a base. Dr. Mario is a clone because he has extremely different attributes that an Echo cannot have. Lucina is an Echo because she has no severe differences from Marth. Her proportions are the same with barely an inch in difference. She lacks the tipper, which isn't an extreme difference. Extreme differences are completely different moves that don't work remotely the same. Even in Chrom's case, his Up B still is heavily based upon another character(Ike, who had the same general body build as Roy, Chrom, and Marth, thus, it was easy to use). He's the most special of Echoes, but still isn't a regular clone even with this.
Outside of Final Smashes, clones have vastly different hitboxes, weights, hurtboxes, and knockback. Dr. Mario actually came close to being an Echo in Melee, but he still has other unique attributes that separated that. Some of the Melee clones were kind of close in general(Falco, Pichu, as well). Roy, Ganondorf, and Young Link were way more different in comparison.